/Engine/Source/Runtime/UMG/Public/Components/ScaleBox.h
Allows you to place content with a desired size and have it scale to meet the constraints placed on this box's alloted area. If you needed to have a background image scale to fill an area but not become distorted with different aspect ratios, or if you need to auto fit some text to an area, this is the control for you.
class UScaleBox : public [UContentWidget](API\Runtime\UMG\Components\UContentWidget)
TOptional< FVec...
DesignerSize
TSharedPtr<SSc...
MyScaleBox